It is the first confirmed rabid animal in Perth County since 2012.
The rabid cow was infected with the arctic fox strain of rabies and is unrelated to the situation occurring in the Hamilton area, said the advisory from the health unit.
Another two rabid raccoons were identified in the Hamilton area this week, bringing the total to 14 since September.
Perth County health inspector Jennifer Grinstead said “it’s very important to vaccinate your pets against rabies to protect you, your family, and your community.”
In Ontario, it is the law that all cats and dogs over three months of age must be vaccinated against rabies.